Mercurial > hg > octave-shane > gnulib-hg
view tests/test-ffsll.c @ 17632:86af85d364e1 default tip
unistd: port readlink to Mac OS X 10.3.9
* lib/unistd.in.h (_GL_INCLUDING_UNISTD_H): New macro, to work
around self-include problem in Mac OS X 10.3.9 when combined with
readlink module. Problem reported by Klaus Zietler in
<http://bugs.gnu.org/16825>.
author | Paul Eggert <eggert@penguin.cs.ucla.edu> |
---|---|
date | Tue, 25 Feb 2014 11:16:27 -0800 |
parents | 344018b6e5d7 |
children |
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/* * Copyright (C) 2011-2014 Free Software Foundation, Inc. * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ /* Written by Eric Blake. */ #include <config.h> #include <string.h> #include "signature.h" SIGNATURE_CHECK (ffsll, int, (long long int)); #include <limits.h> #include "macros.h" #define NBITS (sizeof (long long int) * CHAR_BIT) static int naive (long long int i) { unsigned long long int j; for (j = 0; j < NBITS; j++) if (i & (1ULL << j)) return j + 1; return 0; } int main (int argc, char *argv[]) { long long int x; int i; for (x = -128; x <= 128; x++) ASSERT (ffsll (x) == naive (x)); for (i = 0; i < NBITS; i++) { ASSERT (ffsll (1ULL << i) == naive (1ULL << i)); ASSERT (ffsll (1ULL << i) == i + 1); ASSERT (ffsll (-1ULL << i) == i + 1); } for (i = 0; i < NBITS - 1; i++) { ASSERT (ffsll (3ULL << i) == i + 1); ASSERT (ffsll (-3ULL << i) == i + 1); } for (i = 0; i < NBITS - 2; i++) { ASSERT (ffsll (5ULL << i) == i + 1); ASSERT (ffsll (-5ULL << i) == i + 1); ASSERT (ffsll (7ULL << i) == i + 1); ASSERT (ffsll (-7ULL << i) == i + 1); } return 0; }